Apparatus to facilitate the extraction of a room form

ABSTRACT

An apparatus to facilitate the extraction of a room form which comprises a frame for carrying said room form, said frame carried on a two-axled dolly and being pivotable with respect to said dolly.

ite a-tent 1 Markewiti et al.

[ APPARATUS T0 FACILITATE THE EXTRACTION OF A ROOM FORM [75] IInventors: Wolfgang Markewitz, Hilden; Fritz Mischke, Dusseldorf, bothof Germany [73] Assignee: Fa. Hunnebeck GmhH, Lintor'f,

' Germany [22] Filed:

Feb. 22, 1972 21 Appl. No.: 227,835

[30] Foreign Application Priority Data I Feb. 25, 1971 Germany 2108815[52] U.S. C1 214/1 H, 52/122, 249/36, 425/62 51 Int. Cl. B66c 1/10 [58]Field of Search 425/62, 63; 249/27, 33, 36; 214/1 D, l H; 52/122, 741

l 1 1 .lan. 29, 1974 Primary Examiner-Frank E. Werner Attorney, Agent,or Firm-Ralph D. Dinklage et a1.

[57] ABSTRACT An apparatus to facilitate the extraction of a room formwhich comprises a frame for carrying said room form, said frame carriedon a two-axled dolly and being pivotable with respect to said dolly.

8 Claims, 8 Drawing Figures PMENIEUJAH 29 1574 SHEET 1 BF 5 PATENTEUJAN29 m4 SHEET 3 OF 5 PATENTED JAN 2 9 I974 SHEET Q 0F 5 PMHEM imaam .SHEET5 BF 5 APPARATUS TO FACILITATE THE EXTRACTION OF A ROOM FORMBACKGROUND-OF THE INVENTION DISCUSSION OF THE PRIOR ART For theextraction of a room form from a portion of a building that has beenmade by means of a form a hooklike device is presently being used. Forsuch device generally a crane hook is used. The hook-like device issuspended from the crane hook and reaches under the upper part of theform. Such devices are relatively heavy and correspondingly expensive.Thus, it has become desirable to provide a means which will carry theform for use in poured concrete construction, which device can readilybe removed after the concrete has set. l I

It is an object of this invention to provide a less expensive apparatusthan heretofore utilized to facilitate the extraction of the room form.More particularly, it is an object of this invention to provide a meansfor carrying such a room form which, through the use of a dolly and aheight adjusting frame, can readily be removed from the room defined bythe concrete walls.

SUMMARY or THE INVENTION Broadly, this invention contemplates anapparatus to facilitate the" extraction of a room form which comprises aframe for carrying said room form, said frame carried on a two-axleddolly and being pivotable with respect to said dolly.

Inaccordance with this invention, there is provided an apparatus whichfacilitates the extraction of a room form used in poured concreteconstruction. The apparatus comprises a frame, preferably aheight-adjusting frame, carried on a two axled dolly..The frame ispivotable with respect to the dolly. The dolly comprises two wheels, toone of which is affixed a supporting means having a flat bottom disposeda'distance above the tangential plane joining the wheels of the dolly onits bottom. The purpose of the supporting means is to provide supportfor the frame and the form carried thereon during extraction of theapparatus from the area within freshly poured and set concrete.Generally, the supporting means has a high coefficient of friction withre spect to concrete and can suitably be a block of wood disposedangularly from one of the wheels, i.e., the wheel first withdrawn fromthe room.

The dolly comprises two beams which are joined or articulated at an axleof one of the wheels of the dolly. The beams are preferably constructedsuch that one beam carries a socket which supports the frame of theapparatus. The other beam connects the two axes of the wheels of thedolly. Preferably, the beams form an angle which is variable whereby theheight of the entire frame can be regulated. In a preferred embodimentof the invention a hydraulic cylinder is utilized containing aconnecting rod connected to an upper end of the beam'carrying thesocket. Actuation of the hydraulic cylinder raises and lowers the beamwith respect to the dolly and thus raises or lowers the frame carried inthe socket.

In a particularly desirable embodiment, the invention comprises a framehaving a generally flat top member supported by generally verticalangularly disposed struts carried in the socket, in turn carried by oneof the beams articulated to an axle of one of the wheels of the dolly.The frame member and dolly can be utilized together with a second framemember and dolly by disposing the same in general alignment andproviding a connecting means between the generally flat members as morefully disclosed below.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show a preferredembodiment of the invention.

FIGS. 1 to 4 are side elevations showing the apparatus in four differentworking positions;

FIG. 5 is a sectional view taken along line V-V of FIG. 1;

FIGS. 6 and 7 show an enlarged scale of the lower part of the apparatusin three different positions.

FIG. 8 is a view similar to FIGS. 6 and 7 showing the small front wheel12 removed from the room, the support member or block 13 in supportingposition and wheel within the structure.

DESCRIPTION OF SPECIFIC EMBODIMENT The illustrated apparatus of theinvention consists of a dolly 1 having a socket 5 holding the lower endsof struts 2,3, whose upper ends are attached to a horizontal supportingframe 4. Parts 2 to 5 form a frame for carrying the room form.

The dolly 1 consists of two beams 7 parallel to one another and a beam 8disposed between these beams, the socket 5 being fastened to beam 8 bymeans of a pivot pin 6. Beams 7 and 8 are joined together at their oneend by an axle 9 on which a wheel 10 is mounted. The other, forward endsof the beams 7 are joined together by an axle 11 on each of whose endsthere is mounted a wheel 11. Wheels'l2 have a smaller diameter thanwheels 10. Between the two beams 7, there is a support member or block13 of another material having a high coefficient of friction in relationto concrete, such as wood, for example. This block 13 is carried by aplate 14 which is affixed to the beams 7. The plate 14 bears a hydrauliccylinder 15 having a piston whose connecting rod 16 is joined to thefront end of beam 8 by a pin 17. v

v The beams 7 and 8 enclose an angle a as seen in FIG. 6. This angle canbe between and This angle can be diminished by means of the hydrauliccylinder 15 thereby lowering the supports 2 and 3 together with thesupporting frame 4. FIGS. 7 and 8 show the beam tical part a of the roomform. Each of these parts a and consists of a plate whose smooth frontside faces the concrete to be formed and has ribs r on its rear side.Part a, constitutes the form for one half of the roof e, and part aconstitutes the form for a wall f. To provide a form for two walls f andthe entire room e between these walls f, two such room forms areprovided, as shown in FIG. 5. Accordingly, two dollies 1 are provided,each of which bears a supporting frame 4. These two supporting framesare joined together by a connecting piece m. The dollies roll on thepreviously made roof e.

To set up such room forms, the supporting frames are first lowered. Thevertical form parts a are on jacks b, the horizontal form parts a lie onthe supporting frame 4 and the connecting piece m which joins themtogether. Then by means of the cylinders the supporting frames 4 andhence the form parts a are lifted, and by means of the jacks b the formparts a are raised to the same extent. After the concrete roof and theconcrete walls f have been made with this room form, the room form islowered by means of the cylinders 15 and the jacks b. The vertical formparts a are backed off slightly from the walls f, by hand for example.Then a cable hanging from the crane hook h is fastened to an outwardlyprojecting work scaffold, which also serves for protection, and with itthe room form is lifted slightly from the floor c as seen in FIG. 1. Bymoving the crane in the direction of the ar'r'ow P, the entire roomform, whose rearward end runs on the two dollies 1, can be extractedfrom the shell between the floor c and the roof e, see FIG. 2.

As soon as wheel 12 passes over the front edge e of the floor c, thedolly l tilts by the angle [3, whereupon the support member or block 13lies on the top of floor c and thus prevents any further movement ofdolly l as seen in FIGS. 3 and 8. If the crane hook h is then low ered,the rear end of the form part a can engage the roof e (FIG. 3). The roomform in this position is secured against dropping out of the building.Then the room form is attached to a cable i hanging from crane hook hsuch that it is suspended horizontally when the crane hook h is lifted(FIG. 4). By moving the crane in the direction of the arrow P it caneasily be removed from the building as seen in FIG. 4.

The terms and expressions used herein are terms of illustration and notof limitation, as there is no intention, in the use of such terms andexpressions, of excluding any equivalents or portions thereof, asvarious modifications and departures from the specific embodiment shownabove are possible within the scope of the invention claimed. Forexample, it is apparent that both wheels of the dolly could be of thesame size. A single frame member can be constructed having a pair ofwheels on either size thereof and a frame member, the top member ofwhich can have a size sufficient to cover an entire ceiling. Additionalsupport members or struts can be used and frame systems comprising aplurality of such dollies supporting top members of substantial lengthcan be utilized. It is even possible to provide a mechanized dollysystem which supplies power to the wheels of the dolly to facilitatedisposition of the dolly in the building and withdrawal of the dolly andframe. including the room forms after the poured concrete has set.

What is claimed is:

1. An apparatus to facilitate the extraction of a room form comprising ahorizontal part and a vertical part which apparatus comprises a frameforcarrying said room form, said frame carried on a two-axled dollyhaving at least two wheels, said dolly being pivotable with respect tosaid frame, said frame being heightadjustable in relationship to saiddolly, to one of the wheels of said dolly a supporting means beingaffixed having a flat bottom disposed a distance above the plane onwhich said wheels may run, whereby the supporting means contacts thesaid plane when the wheels on the axle leading in the direction of theextraction of the form fall below the level of said plane to causepivoting of the dolly with respect to the frame to thus arrest theextraction of said dolly, frame and form.

2. An apparatus according to claim 1 wherein said dolly comprises twobeams articulated together at the axle of one of the wheels of saiddolly, one of said beams pivotally carrying a socket supporting saidframe and the other of said beams connecting the axle of one of saidwheels to the axle of the other of said. wheels.

3. An apparatus according to claim 2 wherein there is provided meansvarying the angle between said beams whereby to raise or lower saidframe.

4. An apparatus according to claim 3 wherein said means comprises ahydraulic cylinder and a connecting rod connected to the upper end ofthe beam carrying said socket, said cylinder disposed therebeneath.

5. An apparatus according to claim 3 wherein the wheel disposed aboutthe axle where said beams are articulated is larger than the other ofsaid wheels of said dolly.

6. An apparatus according to claim 1 wherein said supporting meanscomprises a block of a material of high coefficient of friction inrelation to concrete.

7. An apparatus according to claim 1 wherein said supporting meanscomprises a block of a material of high coefficient of friction inrelation to concrete which block projects angularly downwardly from thesmaller wheel toward the larger wheel.

8. An apparatus according to claim 7 wherein said frame comprises agenerally horizontal top member supported by a pair of generallyvertical angularly disposed struts, the lower ends of which are carriedin said socket.

1. An apparatus to facilitate the extraction of a room form comprising ahorizontal part and a vertical part which apparatus comprises a framefor carrying said room form, said frame carried on a two-axled dollyhaving at least two wheels, said dolly being pivotable with respect tosaid frame, said frame being heightadjustable in relationship to saiddolly, to one of the wheels of said dolly a supporting means beingaffixed having a flat bottom disposed a distance above the plane onwhich said wheels may run, whereby the supporting means contacts thesaid plane when the wheels on the axle leading in the direction of theextraction of the form fall below the level of said plane to causepivoting of the dolly with respect to the frame to thus arrest theextraction of said dolly, frame and form.
 2. An apparatus according toclaim 1 wherein said dolly comprises two beams articulated together atthe axle of one of the wheels of said dolly, one of said beams pivotallycarrying a socket supporting said frame and the other of said beamsconnecting the axle of one of said wheels to the axle of the other ofsaid wheeLs.
 3. An apparatus according to claim 2 wherein there isprovided means varying the angle between said beams whereby to raise orlower said frame.
 4. An apparatus according to claim 3 wherein saidmeans comprises a hydraulic cylinder and a connecting rod connected tothe upper end of the beam carrying said socket, said cylinder disposedtherebeneath.
 5. An apparatus according to claim 3 wherein the wheeldisposed about the axle where said beams are articulated is larger thanthe other of said wheels of said dolly.
 6. An apparatus according toclaim 1 wherein said supporting means comprises a block of a material ofhigh coefficient of friction in relation to concrete.
 7. An apparatusaccording to claim 1 wherein said supporting means comprises a block ofa material of high coefficient of friction in relation to concrete whichblock projects angularly downwardly from the smaller wheel toward thelarger wheel.
 8. An apparatus according to claim 7 wherein said framecomprises a generally horizontal top member supported by a pair ofgenerally vertical angularly disposed struts, the lower ends of whichare carried in said socket.